Added missing file.

com.oracle.truffle.r.runtime/src/com/oracle/truffle/r/runtime/data/closures/RFactorToStringVectorClosure.java

+/*
+ * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.oracle.truffle.r.runtime.data.closures;
+
+import com.oracle.truffle.r.runtime.*;
+import com.oracle.truffle.r.runtime.ops.na.NACheck;
+import com.oracle.truffle.r.runtime.data.*;
+import com.oracle.truffle.r.runtime.data.model.*;
+
+/*
+ * This closure is meant to be used only for implementation of the binary operators.
+ */
+public class RFactorToStringVectorClosure extends RToStringVectorClosure implements RAbstractStringVector {
+
+    private final RIntVector vector;
+    private final RAbstractStringVector levels;
+
+    public RFactorToStringVectorClosure(RFactor factor, NACheck naCheck) {
+        super(factor.getVector(), naCheck);
+        this.vector = factor.getVector();
+        this.levels = (RAbstractStringVector) vector.getAttr(RRuntime.LEVELS_ATTR_KEY);
+        if (this.levels == null) {
+            RError.warning(RError.Message.IS_NA_TO_NON_VECTOR, "NULL");
+        }
+    }
+
+    public String getDataAt(int index) {
+        if (levels == null) {
+            return RRuntime.STRING_NA;
+        } else {
+            return this.levels.getDataAt(vector.getDataAt(index) - 1);
+        }
+    }
+}